What is completely taking over a physiological function by extracorporeal means known as?

The term that describes the complete takeover of a physiological function by extracorporeal means is "performance." In this context, "performance" refers to the act of a device or external system entirely completing a bodily function that the body itself is unable to manage.

For example, in medical procedures, this could involve the use of dialysis machines that take over the function of the kidneys in filtering blood, or mechanical ventilation machines that assist patients whose lungs cannot effectively take in oxygen. These devices perform functions that would typically be managed by the patient’s body, thus ensuring that the necessary physiological processes continue.

This concept is rooted in ICD-10-PCS coding, where specific terms are crucial for accurately describing the nature of procedures and interventions performed. The other terms provided in the options refer to different levels of interaction with bodily functions, such as "assistance" implying help rather than complete takeover, or "support," which denotes supplementary aid rather than full replacement. "Assurance" does not pertain to the physiological functions at all. Understanding this distinction helps in applying proper coding practices consistent with medical procedures.